Siemens, SIRIUS 3RU2 Thermal Overload Relay 1 NO/1 NC, Trip Dial: 28 → 40 A, 40A F.L.C, 40A Contact Rating, 22 kW 3P

RS Stock No.:: 875-1093
Mfr. Part No.:: 3RU2136-4FB0
Brand:: Siemens

Siemens, SIRIUS 3RU2 Thermal Overload Relay 1 NO/1 NC, Trip Dial: 28 → 40 A, 40A F.L.C, 40A Contact Rating, 22 kW 3P

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$287.83

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$316.61

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RS Stock No.:: 875-1093
Mfr. Part No.:: 3RU2136-4FB0
Brand:: Siemens

Specifications

Technical data sheets

Legislation and Compliance

Product Details

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	Siemens
	FLC Motor Rating	40A
	Product Type	Thermal Overload Relay
	Relay Contact Current	40A
	Series	SIRIUS 3RU2
	Mount Type	Direct
	Power Rating	22kW
	Pole and Throw Configuration	3P
	Terminal Type	Screw
	Normal State Configuration	1 NO/1 NC
	IP Rating	IP65, IP55
	Reset Method	Automatic & Manual
	Adjustable Current Range	28 → 40 A
	Number of Auxiliary Contacts	2
	Width	76.5mm
	Minimum Operating Temperature	-40°C
	Contact Voltage	690V ac
	Length	55mm
	Maximum Operating Temperature	70°C
	Standards/Approvals	UKCA, REACH, CCC, UL, EAC, IEC, WEEE (2012/19/EU), RoHS, CE
	Depth	104.2mm

	Select all
	Brand Siemens
	FLC Motor Rating 40A
	Product Type Thermal Overload Relay
	Relay Contact Current 40A
	Series SIRIUS 3RU2
	Mount Type Direct
	Power Rating 22kW
	Pole and Throw Configuration 3P
	Terminal Type Screw
	Normal State Configuration 1 NO/1 NC
	IP Rating IP65, IP55
	Reset Method Automatic & Manual
	Adjustable Current Range 28 → 40 A
	Number of Auxiliary Contacts 2
	Width 76.5mm
	Minimum Operating Temperature -40°C
	Contact Voltage 690V ac
	Length 55mm
	Maximum Operating Temperature 70°C
	Standards/Approvals UKCA, REACH, CCC, UL, EAC, IEC, WEEE (2012/19/EU), RoHS, CE
	Depth 104.2mm

RoHS Status: Exempt

COO (Country of Origin):: DE

Siemens SIRIUS 3RU2 Series Thermal Overload Relay, 28 to 40A Adjustable Current, 22kW Power - 3RU2136-4FB0

This thermal overload relay provides motor protection by monitoring and interrupting excessive motor current in three-phase systems. Designed for contactor mounting, it delivers thermal protection across an adjustable current range and supports both automatic and manual reset modes. The device operates at supply voltages up to 690 V ac and is suitable for installation where ambient temperatures range from −40 °C to +70 °C.

Features and Benefits:

• 28 to 40 A adjustable range offering precise motor protection
• 40 A operational current enabling up to 22 kW at 500 V
• Class 10 trip behaviour limiting motor thermal stress
• IP20 front protection with finger-safe touch prevention
• Screw terminals for main and auxiliary circuits allowing robust connections

Applications

• Used with contactors in industrial motor control panels
• Suitable for three-phase motor protection up to 22 kW
• Ideal for retrofitting in existing control installations
• Can be used for requiring automatic/manual reset modes

What reset options does it provide?

It supports automatic and manual reset, with a typical recovery time of 10 min after an overload trip.

How many auxiliary contacts are available and what is their purpose?

It includes one NO contact for trip signalling and one NC contact for contactor disconnection.

What are the Terminal and conductor connection capabilities?

Main screw Terminals accept solid or stranded conductors up to 50 mm², or two conductors per Terminal where specified

auxiliary terminals accept up to 2.5 mm².

What short-circuit protection is required for the auxiliary circuit?

A 6 A protective device is required for the auxiliary switch where SCC ≤ 0.5 kA and U ≤ 260 V.

Note

Screw Terminals can only be used with screw Terminal overloads and spring Terminals can only be used with spring Terminal overloads.

Approvals

CE, UL, CSA